Scientists often make explanations about some aspect of the natural world when facts have been repeatedly confirmed through observations. Which of the following terms refers to these explanations? A=hypothesis
B=inference
C=theory
D=law

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explanation:

"a.) well–developed vascular system."

i thinking chemical change

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what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.